set terminal postscript eps 20
set output 'groupme-evolution-number.eps'

set xdata time 
set timefmt "%Y-%m-%d" 
set format x "%b %d"
set xrange ["2007-07-10":"2007-12-20"]
set xlabel 'date' font "Arial,26"
set ylabel 'number of groups/resources' font "Arial,26"

show terminal
plot 'evolution-number-of-resources-and-groups.txt' using 1:2 with lines lw 1 lt 3		title "resources and groups", \
	'evolution-number-of-resources.txt' 			using 1:2 with lines lw 3 lt 1  	title "resources", \
	'evolution-number-of-groups.txt' 				using  1:2 with lines lw 3 lt 2		title "groups"